"I would have noticed if you've been missing for a month, true," Gen said wryly, as if that was the understatement of the year. The entire world would notice if Senku had vanished for a month, even if they weren't the driving force behind rebuilding everything any longer. At times he wondered how much Senku discounted how crucial he was.

He hummed. "I'm sure there's an explanation somewhere about REM cycles or something making our time here pass quickly."